19.2 Gross Anatomy of the Heart

1			The valve that lies between the right atrium and the right ventricle is the ________________ valve.
			A)	aortic semilunar
			B)	tricuspid
			C)	mitral
			D)	bicuspid
2			Which of the following valves keeps blood from backing up into the left ventricle?
			A)	pulmonary valve
			B)	bicuspid valve
			C)	aortic valve
			D)	tricuspid valve

19.3 Cardiac Muscle and the Cardiac Conduction System

3			The small patch of heart tissue that depolarizes spontaneously to begin each heartbeat is the
			A)	node of His.
			B)	sinoatrial node.
			C)	atrioventricular node.
			D)	superior cardiac node.
4			Which of the following is not one of the features of an intercalated disc?
			A)	Purkinje fibers
			B)	electrical junctions
			C)	mechanical junctions
			D)	interdigitating folds

19.4 Electrical and Contractile Activity of the Heart

5			An electrocardiogram is a graphical representation of
			A)	atrial depolarization.
			B)	ventricular depolarization.
			C)	both atrial and ventricular depolarization.
			D)	atrial and ventricular de- and repolarization.
6			An elongated P wave suggests
			A)	a problem with ventricular depolarization.
			B)	a problem with atrial depolarization.
			C)	a problem with atrial repolarization.
			D)	a problem with ventricular repolarization.
7			The T wave indicates
			A)	ventricular repolarization.
			B)	atrial repolarization.
			C)	ventricular depolarization.
			D)	atrial depolarization.

19.5 Blood Flow, Heart Sounds, and the Cardiac Cycle

8			The first heart sound heard is the result of
			A)	closure of the AV valves.
			B)	closure of the semilunar valves.
			C)	opening of the AV valves.
			D)	opening of the semilunar valve.
9			Atrial pressure is at its highest when
			A)	the AV valves are closed.
			B)	the AV valves are open.
			C)	the semilunar valves are closed.
			D)	The valves have no influence on atrial pressure.
10			If the time of ventricular filling were increased in duration
			A)	less blood would flow into the ventricles.
			B)	the end diastolic volume (EDV) would be greater.
			C)	the end systolic volume (ESV) would be greater.
			D)	the EDV and ESV would remain the same.